Hartebeesthoek94 Lo21 - ESRI:102483

WKT

PROJCS["Hartebeesthoek94_Lo21", 
	GEOGCS["GCS_Hartebeesthoek_1994", 
		DATUM["D_Hartebeesthoek_1994", 
			SPHEROID["WGS_1984", 6378137.0, 298.257223563]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 0.0], 
	PARAMETER["False_Northing", 0.0], 
	PARAMETER["Central_Meridian", 21.0], 
	PARAMETER["Scale_Factor", -1.0], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Hartebeesthoek94_Lo21", 
	BASEGEOGCRS["GCS_Hartebeesthoek_1994", 
		DATUM["D_Hartebeesthoek_1994", 
			ELLIPSOID["WGS_1984", 6378137.0, 298.257223563]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 0.0], 
		PARAMETER["False_Northing", 0.0], 
		PARAMETER["Central_Meridian", 21.0], 
		PARAMETER["Scale_Factor", -1.0], 
		PARAMETER["Latitude_Of_Origin", 0.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["Esri", "102483"]]

Data from @esri/proj-codes

{
  "wkid": 102483,
  "latestWkid": 102483,
  "gcsWkid": 4148,
  "macro": "PE_PCS_HARTEBEESTHOEK94_LO21",
  "name": "Hartebeesthoek94_Lo21",
  "wkt": "PROJCS[\"Hartebeesthoek94_Lo21\",GEOGCS[\"GCS_Hartebeesthoek_1994\",DATUM[\"D_Hartebeesthoek_1994\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",21.0],PARAMETER[\"Scale_Factor\",-1.0],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Hartebeesthoek94_Lo21\",BASEGEOGCRS[\"GCS_Hartebeesthoek_1994\",DATUM[\"D_Hartebeesthoek_1994\",ELLIPSOID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",21.0],PARAMETER[\"Scale_Factor\",-1.0],PARAMETER[\"Latitude_Of_Origin\",0.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"Esri\",\"102483\"]]",
  "description": "Hartebeesthoek94 Lo21",
  "authority": "Esri",
  "version": "10.0.0",
  "deprecated": "no",
  "areaname": "South Africa - 20~E to 22~E",
  "extent": {
    "slat": -34.88,
    "nlat": -24.76,
    "llon": 19.99,
    "rlon": 22.01
  }
}